21.   At three sites the levels were above the EC action limit at which steps to improve air quality must be taken.

22.   Among the litany of environmental problems it lists soil degradation, groundwater pollution, low quality of drinking water, deteriorating air quality and deforestation.

23.   A survey by the environmental group Friends of the Earth has revealed that air quality in four British towns is breaching safety levels set by the EC.

24.   The air quality over much of Britain deteriorated during hot weather in May, with a build up of photochemical smog in some areas.

25.   The US administration is planning to weaken a provision in the clean air laws designed to preserve air quality in unpolluted areas.

26.   Coal industry experts argue that an improvement in air quality could be achieved by replacing the lignite now burnt at the power stations with hard coal.

27.   Friends of the Earth has claimed that the British government is failing to alert the public adequately when ozone levels in the atmosphere cause a deterioration of air quality.

28.   But government air-quality bulletins warned of poor air quality for ozone on only three days.

29.   A SCIENTIST has dispelled fears that equipment to monitor air quality was being wrongly sited in Middlesbrough.

30.   CandP occupational health experts are co-operating fully with their counterparts in community health and are working with Langbaurgh Environmental Health to improve knowledge of local air quality.